Get U-position of nurbs curve point? 2004-06-18 - By Schoenberger
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Thanks, with that I have a way to get the information I need.
>> -- --Original Message-- --
>> From: owner-xsi@(protected)
>> [mailto:owner-xsi@(protected)] On Behalf Of Felix Gebhardt
>> Sent: Friday, June 18, 2004 10:21 PM
>> To: XSI@(protected)
>> Subject: Re: Get U-position of nurbs curve point?
>>
>>
>>
>> Hey Holger, if you use EvaluatePosition with an even
>> number you already have
>> the knot position. At least if the curve parametrisation
>> is non uniform.
>>
>> Cheers,
>> Felix
>>
>>
>> -- 8< -- ---- ---- ---- ---- ---- ---- ---- ---- ------
>>
>> NewScene
>> SICreateCurve "crvlist", 3, 0
>> SIAddPointOnCurveAtEnd "crvlist", 3, 0, -3, False, 0
>> SIAddPointOnCurveAtEnd "crvlist", -1, 0, -2, False, 0
>> SIAddPointOnCurveAtEnd "crvlist", 2, 0, 1, False, 0
>> SIAddPointOnCurveAtEnd "crvlist", -1, 0, 3, False, 0
>> SIAddPointOnCurveAtEnd "crvlist", -4, 0, 1, False, 0
>> SIAddPointOnCurveAtEnd "crvlist", -3, 0, -2, False, 0
>> SIAddPointOnCurveAtEnd "crvlist", 0, 0, -3, False, 0
>> SetValue "Views.ViewA.TopCamera.camvis.compobjselknot", True
>> SelectObj "crvlist", , True
>>
>>
>> set oCurve = Activesceneroot.findchild("crvlist")
>> set oCurveGeo = oCurve.Activeprimitive.Geometry
>> SetObjPos "vPos", oCurveGeo.Curves(0).EvaluatePosition( 1.0 )(0)
>>
>>
>>
>> '======================================== >> Function SetObjPos
(sChildname, vInVector)
>> '======================================== >>
>> dim oObj, tTrans
>>
>> if Not typename(vInVector) = "ISIVector3" then
>> set vInVector = XSIMath.CreateVector3
>> end if
>>
>> if typename( Activesceneroot.FindChild ( sChildname ) ) =
>> "Nothing" then
>> set oObj = Activesceneroot.AddNull (sChildname)
>> oObj.parameters("size").value = 0.5
>> MakeLocal oObj&".display", siNodePropagation
>> SetValue oObj&".display.wirecol", 367
>> end if
>>
>> set oObj = ActiveSceneRoot.FindChild ( sChildname )
>> set tTrans = oObj.Kinematics.Local.Transform
>> tTrans.SetTranslation vInVector
>> oObj.Kinematics.Local.Transform = tTrans
>>
>> '=========== >> End Function
>> '=========== >>
>> -- 8< -- ---- ---- ---- ---- ---- ---- ---- ---- ------
>>
>>
>>
>>
>>
>>
>> Schoenberger wrote:
>> > I unerstood his way, But I would use te position of the
>> knot instead of
>> > the position of the control point to
>> > get the new position. But I forgot that the Knot doesnot
>> have a position
>> > array....
>> >
>> > damn
>> >
>> >
>> >
>> > >> -- --Original Message-- --
>> > >> From: owner-xsi@(protected)
>> > >> [mailto:owner-xsi@(protected)] On Behalf Of Bradley Gabe
>> > >> Sent: Friday, June 18, 2004 7:40 PM
>> > >> To: XSI@(protected)
>> > >> Subject: Re: Get U-position of nurbs curve point?
>> > >>
>> > >>
>> > >> What Aloys said...
>> > >>
>> > >> 1- Get a pointer to the ControlPoint collection.
>> > >> 2- Get a pointer to the ControlPoint object at its index
>> > >> in the collection.
>> > >> 3- You can access X,Y,Z values of the point as they are
>> > >> properties of a
>> > >> ControlPoint object.
>> > >> 4- Put the XYZ values into a vector3() object.
>> > >> 5- Even though the control point is not directly on the
>> > >> nurbs curve, you
>> > >> can use the GetClosestCurvePosition() method with the
>> > >> vector3() object
>> > >> as input. It will return a collection of data about the
>> > >> coordinates you
>> > >> input.
>> > >>
>> > >> If you're doing this in jscript, you'll want to search the
>> > >> SDK docs for
>> > >> any jscript examples on these methods. As far as I know,
>> > >> it's the only
>> > >> place to get examples of what data is returned at what
>> > >> index position of
>> > >> the return collection.
>> > >>
>> > >> Good luck.
>> > >>
>> > >> -Brad
>> > >>
>> > >> > Hello,
>> > >> > I think you can't!
>> > >> > The main reason is that control points are not on the
>> > >> curve, only
>> > >> > knots are.
>> > >> > I would advice you to use the GetClosestCurvePosition
>> > >> method of the
>> > >> > NurbsCurveList object with the position of th control
>> > >> point : it will
>> > >> > return you the u value.
>> > >> > Good luck!
>> > >> >
>> > >> > --
>> > >> > Aloys Baillet - R&D @ La Maison
>> > >> > --
>> > >> >
>> > >> >
>> > >> >
>> > >> > Schoenberger wrote:
>> > >> >
>> > >> >> Hi
>> > >> >>
>> > >> >> I'm trying to get the position of a nurbs point
>> on a curve.
>> > >> >> Someting like a length from start of the curve
>> to the point.
>> > >> >> I have a little script, that does it, but I need
>> > >> something that works
>> > >> >> with the object model.
>> > >> >> What I have:
>> > >> >> GetCurvePercentageAtKnotIndex "crvlist",
>> > >> MyPointIndex, perc
>> > >> >> clength = GetCurveLength("crvlist")
>> > >> >> PostionOnCurve = clength*perc/100
>> > >> >>
>> > >> >> Now I want that result, but with the object model.
>> > >> >> What I have found till now is:
>> > >> >> .Geometry.length
>> > >> >> .Geometry.curves(0).GetPercentageFromU
>> > >> >> .Geometry.curves(0).ControlPoints
>> > >> >>
>> > >> >>
>> > >> >> Perhaps I am stupid or missed something in the docs,
>> > >> but how to get the
>> > >> >> U position of a Control point?
>> > >> >> With the U position I could get the percentage and
>> > >> everything would be
>> > >> >> fine.
>> > >> >>
>> > >> >>
>> > >> >> Holger Sch�nberger technical director
>> > >> >> The day has 24 hours, if that does not suffice, I will
>> > >> take the night
>> > >> >>
>> > >> >>
>> > >> >> ---
>> > >> >> Unsubscribe? Mail Majordomo@(protected) with the
>> > >> following text in
>> > >> >> body:
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>> > >> >>
>> > >> >>
>> > >> >>
>> > >> >>
>> > >> >>
>> > >> >
>> > >> > ---
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>> > >> >
>> > >> >
>> > >>
>> > >> --
>> > >> Bradley R. Gabe
>> > >> Industrial Light & Magic
>> > >>
>> > >>
>> > >>
>> > >>
>> > >> ---
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>> > >>
>> >
>> >
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